asp中的session到asp.net后就丢弃了。

[dbx]

asp登录
得到session("user_id") ="XXXX"
asp.net页面装载中。
Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Session("user_id") = "SAFDSAF"
If Session("user_id") = "" Then
' Session.Item("user_id")
Response.Write("服务器超时，请重新登录")
' Response.Write(Session.SessionID)
' Response.End()
End If

End Sub

session就不见了。asp与asp.net都是运行在同一台机器上。

[jjcccc]

If Session("user_id").Tostring() = "" Then
' Session.Item("user_id")
Response.Write("服务器超时，请重新登录")
' Response.Write(Session.SessionID)
' Response.End()
End If

[dbx]

为什么要用toString()这个方法。

[jjcccc]

因为Session("user_id")是Object类型

[cnlamar]

好象本来就不通用

[dbx]

不行呀，我试过了，出错呀。

[dbx]

up

[jjcccc]

什么错？

[dbx]

代码如下。

Runtime Error
Description: An application error occurred on the server. The current custom error settings for this application prevent the details of the application error from being viewed remotely (for security reasons). It could, however, be viewed by browsers running on the local server machine.

Details: To enable the details of this specific error message to be viewable on remote machines, please create a <customErrors> tag within a "web.config" configuration file located in the root directory of the current web application. This <customErrors> tag should then have its "mode" attribute set to "Off".


<!-- Web.Config Configuration File -->

<configuration>
<system.web>
<customErrors mode="Off"/>
</system.web>
</configuration>


Notes: The current error page you are seeing can be replaced by a custom error page by modifying the "defaultRedirect" attribute of the application's <customErrors> configuration tag to point to a custom error page URL.


<!-- Web.Config Configuration File -->

<configuration>
<system.web>
<customErrors mode="RemoteOnly" defaultRedirect="mycustompage.htm"/>
</system.web>
</configuration>

[jjcccc]

先把你的web.config里的
<configuration>
<system.web>
<customErrors mode="RemoteOnly" defaultRedirect="mycustompage.htm"/>
</system.web>
</configuration>
改成：
<configuration>
<system.web>
<customErrors mode="Off"/>
</system.web>
</configuration>
然后就看到页面上显示出的真正错误信息。

[dbx]

如下

Object reference not set to an instance of an object.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.


Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

If Session.Item("user_id").ToString() = "" Then
Response.Write("服务器超时，请重新登录")

Response.End()
End If

Dim datetime1 As DateTime
If Not Page.IsPostBack Then
Dim i As Integer
For i = 1 To 12
Dim listitems As New ListItem
listitems.Text = i & "月"
listitems.Value = i
If Month(Now) = i Then listitems.Selected = True
Dp2.Items.Add(listitems)
Next
For i = 2000 To 2006
Dim listitems As New ListItem
listitems.Text = i & "年"
listitems.Value = i
If Year(Now) = i Then listitems.Selected = True
Dp1.Items.Add(listitems)
Next
'+++++++++++++++++++++++++++++++++++++

datetime1 = DateTime.Parse(Dp1.SelectedItem.Value & "-" & Dp2.SelectedItem.Value & "-1")

lbldate.Text = DateTime.Now.Date
import.HRef = "print.aspx?datetime1=" & datetime1
company_report.HRef = "report.aspx?datetime1=" & datetime1

'++++++++++++++++++++++++++
getdatabind("e_gather", datetime1)
End If
datetime1 = DateTime.Parse(Dp1.SelectedItem.Value & "-" & Dp2.SelectedItem.Value & "-1")
company_report.HRef = "report.aspx?datetime1=" & datetime1
End Sub

Private Sub getdatabind(ByVal str As String, ByVal datetime1 As DateTime)

'绑定数据，确定汇总时间。
rp1.DataSource = func1.getDataReader_Proc(str, datetime1)
rp1.DataBind()
End Sub

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

[jjcccc]

If Session.Item("user_id").ToString()=null or Session.Item("user_id").ToString()= "" Then
Response.Write("服务器超时，请重新登录")

Response.End()
End If
我不用VB，语法不一定对！意思是要考虑到Session.Item("user_id")等于空值的情况。（超时后，就为空了，也就引发你的异常信息！）

[dbx]

C#里有Session.Item("user_id").ToString()这种转换吗？在vb里就没有.

好的。

[dbx]

但是asp的session没有拿到呀